Q: Xiaomi Redmi Note 2 can't boot(fails) to recovery mode, cant install 6.1.21?
A: Recovery is not available for lollipop and higher version , and you cannot directly downgrade for updated version .

Q: Loosing connection with mi band. Have to turn off and on bluetooth?
A: Check stable version 7.1.3.0 now after full wipe.

Q: Themes bug on lockscreen, some time on status bar, home screen and any more?
A: Did you use any theme or are you using any themes? If yes then use default them and check whether the issue is solved. Also try this,
Security App>Cleaner, "Cleanup" the unnecessary things.
Settings>Installed Apps>System Launcher, select "Clear Data" (Note: This will collapse home screen alignment).
Updater>Options (three dots on the right top)>Reboot to recovery mode>English>Wipe&Reset>Wipe Cache.
Reboot the device then check.

Q: Phone is not connecting to PC suite?
A: You can try this version: https://www.xiaomidevice.com/blog/official-mi-pc-suite-english-version/

Q: Not able to enter mi account or select update?
A: You are using earlier version of miui. Update your device to the latest version by entering into the recovery mode or try other flashing guide.

Q: Music app cant find majority of the musics?
A: Go to Music app > Settings > you will find the filter audio files options, under that Sort by Size, Length, Folder will be there.. Choose by folder option and select the folders to display.

Q: Prevent pocket dials-don't work?
A: Its not meant to lock the device. It will prevent the phone from unlocking. Lock automatically when its placed in a pocket is not meant to lock the device, it will lock from unlocking the device. It prevents(locks) from unlocking. To check this, lock the device then hide the proximity sensor and press power button to check how the function works. Prevent pocket dials is the function to prevent the pocket dials when the device is locked.

Q: Overheat?
A: It varies depends on the app you are using. As the issue persists only in the particular app that too because of the app issue.

Q: device not detecting while connecting through USB?
A: You can use official Chinese MI PC suite as temporary solution. To use PC's internet try the below steps.
-Connect the device with PC
-Settings> Installed Apps>Security>Test network>USB internet, enable this option

Q: Where is preferred 4G LTE?
A: Wipe cache & user data before flash update still have same problems. So the simple solution is dial *#*#4636#*#*  set to LTE only .

Q: call & microphone after video recording?
A: Try wiping cache.
For this go to Updater app> Tap on the three dots on the top right corner> Reboot to recovery mode> English> Wipe and reset> Wipe cache> Reboot.
Additionally Security app> Cleaner> and clean all junks.

Q: Switched to charge only and now cna't get back to media device?
A: Please try as suggested below...
Install QuickShortcutMaker from Play store.
Open it, Search USB.
"Setting" will appear as a result, tap on it, two sub option will appear, tap on any.
Finally tap Create, you will find new setting icon on your home screen.
Connect your phone to PC and tap on the new settings icon and enable MTP from here

Q: USB debugging, MTP is not working?
A: Please try clearing cache thru recovery and check Updater>Options (three dots on the right top)>Reboot to recovery mode>English>Wipe&Reset>Wipe Cache.
Reboot your device and check.
Check if this helps for making MTP to work...
> Install QuickShortcutMaker from play store.
> search for USB in that app.( you will find two options under header "Settings" with "USB computer connection" mentioned below it.)
> Select any of the two option and finally tap on "Create". (this will create a settings icon on app drawer, use it to change USB connection mode)
Note :- USB connection settings will only work when your phone is connected to PC.

Q: Redmi Note 2 WiFi keep disconnecting?
A: Open Wifi > Advanced Settings > Wifi Sleep  > Never !